<template>
  <el-container class="home-container">
    <!--头部区域-->
    <el-header>
      <div>
        <span>美食推广平台管理系统</span>
      </div>
      <el-button type="info" @click="logout">退出</el-button>
    </el-header>
    <!--主体区域-->
    <el-container>
      <!--侧边栏-->
      <el-aside :width="isCollapse ? '64px' : '200px'">
        <!--侧边栏菜单区域-->
        <el-menu
          :default-active="activePath"
          background-color="#333744"
          text-color="#fff"
          active-text-color="#ffd04b"
          unique-opened
          :collapse="isCollapse"
          :collapse-transition="false"
          router>
          <div class="toggle-button" @click="toggleCollapse">|||</div>
          <!--一级菜单-->
          <el-submenu :index="item.id + ''" v-for="item in menulist" :key="item.id" prop="authName, id">
            <!--一级菜单模板区-->
            <template slot="title">
              <!--图标-->
              <i :class="iconsObj[item.id]"></i>
              <!--文本-->
              <span>{{item.authName}}</span>
            </template>
            <!--二级菜单-->
            <el-menu-item :index="'/' + subItem.path" v-for="subItem in item.children" :key="subItem.id"
                          @click="saveNavState('/' + subItem.path)">
              <template slot="title">
                <!--图标-->
                <i class="el-icon-menu"></i>
                <!--文本-->
                <span>{{subItem.authName}}</span>
              </template>
            </el-menu-item>
          </el-submenu>
        </el-menu>
      </el-aside>
      <!--右侧主体-->
      <el-main>
        <router-view></router-view>
      </el-main>
    </el-container>
  </el-container>
</template>

<script>
export default {
  name: 'Home',
  data () {
    return {
      // 存放菜单栏数据
      menulist: [
        {
          id: 125,
          authName: '用户管理',
          path: 'users',
          children: [{ id: 110, authName: '用户列表', path: 'admin/users', children: [], order: null }],
          order: 1
        },
        {
          id: 101,
          authName: '商家管理',
          path: 'goods',
          children: [
            { id: 104, authName: '商家列表', path: 'admin/merchants', children: [], order: 1 }],
          order: 3
        },
        {
          id: 145,
          authName: '评价管理',
          path: 'reports',
          children: [
            { id: 146, authName: '菜品评价', path: 'admin/remark', children: [], order: null },
            { id: 147, authName: '评价图表', path: 'admin/report', children: [], order: null }
          ],
          order: 5
        }],
      // 存放一级菜单图标数据
      iconsObj: {
        125: 'iconfont icon-users',
        101: 'iconfont icon-shangpin',
        145: 'iconfont icon-baobiao'
      },
      // 是否折叠菜单
      isCollapse: false,
      // 被激活的链接地址
      activePath: ''
    }
  },
  // 生命周期函数，在页面加载时就调用
  created () {
    this.activePath = window.sessionStorage.getItem('activePath')
  },
  methods: {
    // 退出按钮
    logout () {
      // 清空token
      window.sessionStorage.clear()
      // 跳转到主页
      this.$router.push('/home')
    },
    // 收起菜单栏
    toggleCollapse () {
      this.isCollapse = !this.isCollapse
    },
    // 保存链接的激活状态
    saveNavState (activePath) {
      window.sessionStorage.setItem('activePath', activePath)
      this.activePath = activePath
    }
  }
}
</script>

<style lang="less" scoped>
  .home-container {
    height: 100%;
  }

  .el-header {
    background-color: #373d41;
    display: flex;
    justify-content: space-between;
    padding-left: 0;
    align-items: center;
    color: #fff;
    font-size: 20px;

    > div {
      display: flex;
      align-items: center;

      span {
        margin-left: 20px;
      }
    }

    img {
      width: 70px;
      height: 70px;
    }
  }

  .el-aside {
    background-color: #333744;

    .el-menu {
      border-right: none;
    }
  }

  .el-main {
    background-color: #eaedf1;
  }

  .iconfont {
    margin-right: 10px;
  }

  .toggle-button {
    background-color: #4a5064;
    color: white;
    font-size: 12px;
    line-height: 25px;
    text-align: center;
    letter-spacing: 0.2em;
    cursor: pointer;
  }
</style>
